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Stockholders' Deficit - Schedule of Share Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2026 | Mar. 31, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | May 31, 2026 | Mar. 31, 2026 | Apr. 29, 2026
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 2,719 |  | $ 7,469 |  |  | $ 7,469 |
April 2026 Board Authorization |  |  |  |  |  |  |  |  |  | $ 5,000
Ending balance | $ 5,175 | $ 6,879 | $ 5,175 | 5,175 | $ 2,719 | 6,879 | $ 5,175 |  | 2,719 |
Excise tax accrual |  |  |  | 65 |  |  |  |  | $ 40 |
Share repurchase program, additional number of shares authorized (in shares) |  |  |  |  |  |  |  |  |  | 5,000.0
Shares Repurchased |  |  |  |  |  |  |  |  |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |  |  |  |  |  |
Excise tax accrual |  |  |  | 25 |  | $ 2 |  |  |  |
Share Repurchase March 2026 ASR |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased (in shares) |  |  |  |  | 2.0 |  | 0.7 | 2.7 |  |
Average Price Paid Per Share (in dollars per share) |  |  |  |  |  |  | $ 820.04 |  |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |  |  |  |  |  |
Shares repurchased |  |  |  | 0 |  |  |  |  |  |
Share Repurchase Program, Authorized, Number of Shares |  |  |  |  | 2,300.0 |  |  |  | 2,300.0 |
Share Repurchase May 2026 ASR |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased (in shares) |  |  | 2.5 |  |  |  |  |  |  |
Average Price Paid Per Share (in dollars per share) |  |  | $ 754.68 |  |  |  |  |  |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |  |  |  |  |  |
Shares repurchased |  |  |  | $ (2,250) |  |  |  |  |  |
Share Repurchase Program, Authorized, Number of Shares |  |  |  |  |  |  |  | 2,300.0 |  |
Q1 Shares repurchased - Open market |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased (in shares) |  |  |  | 0.4 |  | 0.8 |  |  |  |
Average Price Paid Per Share (in dollars per share) |  |  |  | $ 762.40 |  | $ 709.84 |  |  |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |  |  |  |  |  |
Shares repurchased | $ (13) | $ (9) |  | $ (294) |  | $ (590) |  |  |  |

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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